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IB/srp: Avoid sending a task management function needlessly
[deliverable/linux.git] / drivers / infiniband / ulp / srp / ib_srp.c
CommitLineData
aef9ec39
RD		 1/*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
aef9ec39
RD		 31 */
32
e0bda7d8
BVA		 33#define pr_fmt(fmt) PFX fmt
34
aef9ec39
RD		 35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/slab.h>
38#include <linux/err.h>
39#include <linux/string.h>
40#include <linux/parser.h>
41#include <linux/random.h>
de25968c 42#include <linux/jiffies.h>
aef9ec39 43
60063497 44#include <linux/atomic.h>
aef9ec39
RD		 45
46#include <scsi/scsi.h>
47#include <scsi/scsi_device.h>
48#include <scsi/scsi_dbg.h>
49#include <scsi/srp.h>
3236822b 50#include <scsi/scsi_transport_srp.h>
aef9ec39 51
aef9ec39
RD		 52#include "ib_srp.h"
53
54#define DRV_NAME "ib_srp"
55#define PFX DRV_NAME ": "
56#define DRV_VERSION "0.2"
57#define DRV_RELDATE "November 1, 2005"
58
59MODULE_AUTHOR("Roland Dreier");
60MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
61 "v" DRV_VERSION " (" DRV_RELDATE ")");
62MODULE_LICENSE("Dual BSD/GPL");
63
49248644
DD		 64static unsigned int srp_sg_tablesize;
65static unsigned int cmd_sg_entries;
c07d424d
DD		 66static unsigned int indirect_sg_entries;
67static bool allow_ext_sg;
49248644 68static int topspin_workarounds = 1;
74b0a15b 69
49248644
DD		 70module_param(srp_sg_tablesize, uint, 0444);
71MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
74b0a15b 72
49248644
DD		 73module_param(cmd_sg_entries, uint, 0444);
74MODULE_PARM_DESC(cmd_sg_entries,
75 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
aef9ec39 76
c07d424d
DD		 77module_param(indirect_sg_entries, uint, 0444);
78MODULE_PARM_DESC(indirect_sg_entries,
79 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
80
81module_param(allow_ext_sg, bool, 0444);
82MODULE_PARM_DESC(allow_ext_sg,
83 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
84
aef9ec39
RD		 85module_param(topspin_workarounds, int, 0444);
86MODULE_PARM_DESC(topspin_workarounds,
87 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
88
aef9ec39
RD		 89static void srp_add_one(struct ib_device *device);
90static void srp_remove_one(struct ib_device *device);
9c03dc9f
BVA		 91static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
92static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
aef9ec39
RD		 93static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
94
3236822b
FT		 95static struct scsi_transport_template *ib_srp_transport_template;
96
aef9ec39
RD		 97static struct ib_client srp_client = {
98 .name = "srp",
99 .add = srp_add_one,
100 .remove = srp_remove_one
101};
102
c1a0b23b
MT		 103static struct ib_sa_client srp_sa_client;
104
aef9ec39
RD		 105static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
106{
107 return (struct srp_target_port *) host->hostdata;
108}
109
110static const char *srp_target_info(struct Scsi_Host *host)
111{
112 return host_to_target(host)->target_name;
113}
114
5d7cbfd6
RD		 115static int srp_target_is_topspin(struct srp_target_port *target)
116{
117 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
3d1ff48d 118 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
5d7cbfd6
RD		 119
120 return topspin_workarounds &&
3d1ff48d
RK		 121 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
122 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
5d7cbfd6
RD		 123}
124
aef9ec39
RD		 125static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
126 gfp_t gfp_mask,
127 enum dma_data_direction direction)
128{
129 struct srp_iu *iu;
130
131 iu = kmalloc(sizeof *iu, gfp_mask);
132 if (!iu)
133 goto out;
134
135 iu->buf = kzalloc(size, gfp_mask);
136 if (!iu->buf)
137 goto out_free_iu;
138
05321937
GKH		 139 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
140 direction);
141 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
aef9ec39
RD		 142 goto out_free_buf;
143
144 iu->size = size;
145 iu->direction = direction;
146
147 return iu;
148
149out_free_buf:
150 kfree(iu->buf);
151out_free_iu:
152 kfree(iu);
153out:
154 return NULL;
155}
156
157static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
158{
159 if (!iu)
160 return;
161
05321937
GKH		 162 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
163 iu->direction);
aef9ec39
RD		 164 kfree(iu->buf);
165 kfree(iu);
166}
167
168static void srp_qp_event(struct ib_event *event, void *context)
169{
e0bda7d8 170 pr_debug("QP event %d\n", event->event);
aef9ec39
RD		 171}
172
173static int srp_init_qp(struct srp_target_port *target,
174 struct ib_qp *qp)
175{
176 struct ib_qp_attr *attr;
177 int ret;
178
179 attr = kmalloc(sizeof *attr, GFP_KERNEL);
180 if (!attr)
181 return -ENOMEM;
182
969a60f9
RD		 183 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
184 target->srp_host->port,
185 be16_to_cpu(target->path.pkey),
186 &attr->pkey_index);
aef9ec39
RD		 187 if (ret)
188 goto out;
189
190 attr->qp_state = IB_QPS_INIT;
191 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
192 IB_ACCESS_REMOTE_WRITE);
193 attr->port_num = target->srp_host->port;
194
195 ret = ib_modify_qp(qp, attr,
196 IB_QP_STATE |
197 IB_QP_PKEY_INDEX |
198 IB_QP_ACCESS_FLAGS |
199 IB_QP_PORT);
200
201out:
202 kfree(attr);
203 return ret;
204}
205
9fe4bcf4
DD		 206static int srp_new_cm_id(struct srp_target_port *target)
207{
208 struct ib_cm_id *new_cm_id;
209
05321937 210 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
9fe4bcf4
DD		 211 srp_cm_handler, target);
212 if (IS_ERR(new_cm_id))
213 return PTR_ERR(new_cm_id);
214
215 if (target->cm_id)
216 ib_destroy_cm_id(target->cm_id);
217 target->cm_id = new_cm_id;
218
219 return 0;
220}
221
aef9ec39
RD		 222static int srp_create_target_ib(struct srp_target_port *target)
223{
224 struct ib_qp_init_attr *init_attr;
73aa89ed
IR		 225 struct ib_cq *recv_cq, *send_cq;
226 struct ib_qp *qp;
aef9ec39
RD		 227 int ret;
228
229 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
230 if (!init_attr)
231 return -ENOMEM;
232
73aa89ed
IR		 233 recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
234 srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
235 if (IS_ERR(recv_cq)) {
236 ret = PTR_ERR(recv_cq);
da9d2f07 237 goto err;
aef9ec39
RD		 238 }
239
73aa89ed
IR		 240 send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
241 srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
242 if (IS_ERR(send_cq)) {
243 ret = PTR_ERR(send_cq);
da9d2f07 244 goto err_recv_cq;
9c03dc9f
BVA		 245 }
246
73aa89ed 247 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
aef9ec39
RD		 248
249 init_attr->event_handler = srp_qp_event;
250 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
251 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
252 init_attr->cap.max_recv_sge = 1;
253 init_attr->cap.max_send_sge = 1;
254 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
255 init_attr->qp_type = IB_QPT_RC;
73aa89ed
IR		 256 init_attr->send_cq = send_cq;
257 init_attr->recv_cq = recv_cq;
aef9ec39 258
73aa89ed
IR		 259 qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
260 if (IS_ERR(qp)) {
261 ret = PTR_ERR(qp);
da9d2f07 262 goto err_send_cq;
aef9ec39
RD		 263 }
264
73aa89ed 265 ret = srp_init_qp(target, qp);
da9d2f07
RD		 266 if (ret)
267 goto err_qp;
aef9ec39 268
73aa89ed
IR		 269 if (target->qp)
270 ib_destroy_qp(target->qp);
271 if (target->recv_cq)
272 ib_destroy_cq(target->recv_cq);
273 if (target->send_cq)
274 ib_destroy_cq(target->send_cq);
275
276 target->qp = qp;
277 target->recv_cq = recv_cq;
278 target->send_cq = send_cq;
279
da9d2f07
RD		 280 kfree(init_attr);
281 return 0;
282
283err_qp:
73aa89ed 284 ib_destroy_qp(qp);
da9d2f07
RD		 285
286err_send_cq:
73aa89ed 287 ib_destroy_cq(send_cq);
da9d2f07
RD		 288
289err_recv_cq:
73aa89ed 290 ib_destroy_cq(recv_cq);
da9d2f07
RD		 291
292err:
aef9ec39
RD		 293 kfree(init_attr);
294 return ret;
295}
296
297static void srp_free_target_ib(struct srp_target_port *target)
298{
299 int i;
300
301 ib_destroy_qp(target->qp);
9c03dc9f
BVA		 302 ib_destroy_cq(target->send_cq);
303 ib_destroy_cq(target->recv_cq);
aef9ec39 304
73aa89ed
IR		 305 target->qp = NULL;
306 target->send_cq = target->recv_cq = NULL;
307
aef9ec39
RD		 308 for (i = 0; i < SRP_RQ_SIZE; ++i)
309 srp_free_iu(target->srp_host, target->rx_ring[i]);
dd5e6e38 310 for (i = 0; i < SRP_SQ_SIZE; ++i)
aef9ec39
RD		 311 srp_free_iu(target->srp_host, target->tx_ring[i]);
312}
313
314static void srp_path_rec_completion(int status,
315 struct ib_sa_path_rec *pathrec,
316 void *target_ptr)
317{
318 struct srp_target_port *target = target_ptr;
319
320 target->status = status;
321 if (status)
7aa54bd7
DD		 322 shost_printk(KERN_ERR, target->scsi_host,
323 PFX "Got failed path rec status %d\n", status);
aef9ec39
RD		 324 else
325 target->path = *pathrec;
326 complete(&target->done);
327}
328
329static int srp_lookup_path(struct srp_target_port *target)
330{
331 target->path.numb_path = 1;
332
333 init_completion(&target->done);
334
c1a0b23b 335 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
05321937 336 target->srp_host->srp_dev->dev,
aef9ec39
RD		 337 target->srp_host->port,
338 &target->path,
247e020e 339 IB_SA_PATH_REC_SERVICE_ID |
aef9ec39
RD		 340 IB_SA_PATH_REC_DGID |
341 IB_SA_PATH_REC_SGID |
342 IB_SA_PATH_REC_NUMB_PATH |
343 IB_SA_PATH_REC_PKEY,
344 SRP_PATH_REC_TIMEOUT_MS,
345 GFP_KERNEL,
346 srp_path_rec_completion,
347 target, &target->path_query);
348 if (target->path_query_id < 0)
349 return target->path_query_id;
350
351 wait_for_completion(&target->done);
352
353 if (target->status < 0)
7aa54bd7
DD		 354 shost_printk(KERN_WARNING, target->scsi_host,
355 PFX "Path record query failed\n");
aef9ec39
RD		 356
357 return target->status;
358}
359
360static int srp_send_req(struct srp_target_port *target)
361{
362 struct {
363 struct ib_cm_req_param param;
364 struct srp_login_req priv;
365 } *req = NULL;
366 int status;
367
368 req = kzalloc(sizeof *req, GFP_KERNEL);
369 if (!req)
370 return -ENOMEM;
371
372 req->param.primary_path = &target->path;
373 req->param.alternate_path = NULL;
374 req->param.service_id = target->service_id;
375 req->param.qp_num = target->qp->qp_num;
376 req->param.qp_type = target->qp->qp_type;
377 req->param.private_data = &req->priv;
378 req->param.private_data_len = sizeof req->priv;
379 req->param.flow_control = 1;
380
381 get_random_bytes(&req->param.starting_psn, 4);
382 req->param.starting_psn &= 0xffffff;
383
384 /*
385 * Pick some arbitrary defaults here; we could make these
386 * module parameters if anyone cared about setting them.
387 */
388 req->param.responder_resources = 4;
389 req->param.remote_cm_response_timeout = 20;
390 req->param.local_cm_response_timeout = 20;
391 req->param.retry_count = 7;
392 req->param.rnr_retry_count = 7;
393 req->param.max_cm_retries = 15;
394
395 req->priv.opcode = SRP_LOGIN_REQ;
396 req->priv.tag = 0;
49248644 397 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
aef9ec39
RD		 398 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
399 SRP_BUF_FORMAT_INDIRECT);
0c0450db 400 /*
3cd96564 401 * In the published SRP specification (draft rev. 16a), the
0c0450db
R		 402 * port identifier format is 8 bytes of ID extension followed
403 * by 8 bytes of GUID. Older drafts put the two halves in the
404 * opposite order, so that the GUID comes first.
405 *
406 * Targets conforming to these obsolete drafts can be
407 * recognized by the I/O Class they report.
408 */
409 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
410 memcpy(req->priv.initiator_port_id,
01cb9bcb 411 &target->path.sgid.global.interface_id, 8);
0c0450db 412 memcpy(req->priv.initiator_port_id + 8,
01cb9bcb 413 &target->initiator_ext, 8);
0c0450db
R		 414 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
415 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
416 } else {
417 memcpy(req->priv.initiator_port_id,
01cb9bcb
IR		 418 &target->initiator_ext, 8);
419 memcpy(req->priv.initiator_port_id + 8,
420 &target->path.sgid.global.interface_id, 8);
0c0450db
R		 421 memcpy(req->priv.target_port_id, &target->id_ext, 8);
422 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
423 }
424
aef9ec39
RD		 425 /*
426 * Topspin/Cisco SRP targets will reject our login unless we
01cb9bcb
IR		 427 * zero out the first 8 bytes of our initiator port ID and set
428 * the second 8 bytes to the local node GUID.
aef9ec39 429 */
5d7cbfd6 430 if (srp_target_is_topspin(target)) {
7aa54bd7
DD		 431 shost_printk(KERN_DEBUG, target->scsi_host,
432 PFX "Topspin/Cisco initiator port ID workaround "
433 "activated for target GUID %016llx\n",
434 (unsigned long long) be64_to_cpu(target->ioc_guid));
aef9ec39 435 memset(req->priv.initiator_port_id, 0, 8);
01cb9bcb 436 memcpy(req->priv.initiator_port_id + 8,
05321937 437 &target->srp_host->srp_dev->dev->node_guid, 8);
aef9ec39 438 }
aef9ec39
RD		 439
440 status = ib_send_cm_req(target->cm_id, &req->param);
441
442 kfree(req);
443
444 return status;
445}
446
ef6c49d8
BVA		 447static bool srp_queue_remove_work(struct srp_target_port *target)
448{
449 bool changed = false;
450
451 spin_lock_irq(&target->lock);
452 if (target->state != SRP_TARGET_REMOVED) {
453 target->state = SRP_TARGET_REMOVED;
454 changed = true;
455 }
456 spin_unlock_irq(&target->lock);
457
458 if (changed)
459 queue_work(system_long_wq, &target->remove_work);
460
461 return changed;
462}
463
294c875a
BVA		 464static bool srp_change_conn_state(struct srp_target_port *target,
465 bool connected)
466{
467 bool changed = false;
468
469 spin_lock_irq(&target->lock);
470 if (target->connected != connected) {
471 target->connected = connected;
472 changed = true;
473 }
474 spin_unlock_irq(&target->lock);
475
476 return changed;
477}
478
aef9ec39
RD		 479static void srp_disconnect_target(struct srp_target_port *target)
480{
294c875a
BVA		 481 if (srp_change_conn_state(target, false)) {
482 /* XXX should send SRP_I_LOGOUT request */
aef9ec39 483
294c875a
BVA		 484 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
485 shost_printk(KERN_DEBUG, target->scsi_host,
486 PFX "Sending CM DREQ failed\n");
294c875a 487 }
e6581056 488 }
aef9ec39
RD		 489}
490
8f26c9ff
DD		 491static void srp_free_req_data(struct srp_target_port *target)
492{
c07d424d 493 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
8f26c9ff
DD		 494 struct srp_request *req;
495 int i;
496
497 for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) {
498 kfree(req->fmr_list);
499 kfree(req->map_page);
c07d424d
DD		 500 if (req->indirect_dma_addr) {
501 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
502 target->indirect_size,
503 DMA_TO_DEVICE);
504 }
505 kfree(req->indirect_desc);
8f26c9ff
DD		 506 }
507}
508
683b159a
BVA		 509/**
510 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
511 * @shost: SCSI host whose attributes to remove from sysfs.
512 *
513 * Note: Any attributes defined in the host template and that did not exist
514 * before invocation of this function will be ignored.
515 */
516static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
517{
518 struct device_attribute **attr;
519
520 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
521 device_remove_file(&shost->shost_dev, *attr);
522}
523
ee12d6a8
BVA		 524static void srp_remove_target(struct srp_target_port *target)
525{
ef6c49d8
BVA		 526 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
527
ee12d6a8
BVA		 528 srp_del_scsi_host_attr(target->scsi_host);
529 srp_remove_host(target->scsi_host);
530 scsi_remove_host(target->scsi_host);
ef6c49d8 531 srp_disconnect_target(target);
ee12d6a8
BVA		 532 ib_destroy_cm_id(target->cm_id);
533 srp_free_target_ib(target);
534 srp_free_req_data(target);
535 scsi_host_put(target->scsi_host);
536}
537
c4028958 538static void srp_remove_work(struct work_struct *work)
aef9ec39 539{
c4028958 540 struct srp_target_port *target =
ef6c49d8 541 container_of(work, struct srp_target_port, remove_work);
aef9ec39 542
ef6c49d8 543 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
aef9ec39 544
b3589fd4 545 spin_lock(&target->srp_host->target_lock);
aef9ec39 546 list_del(&target->list);
b3589fd4 547 spin_unlock(&target->srp_host->target_lock);
aef9ec39 548
ee12d6a8 549 srp_remove_target(target);
aef9ec39
RD		 550}
551
dc1bdbd9
BVA		 552static void srp_rport_delete(struct srp_rport *rport)
553{
554 struct srp_target_port *target = rport->lld_data;
555
556 srp_queue_remove_work(target);
557}
558
aef9ec39
RD		 559static int srp_connect_target(struct srp_target_port *target)
560{
9fe4bcf4 561 int retries = 3;
aef9ec39
RD		 562 int ret;
563
294c875a
BVA		 564 WARN_ON_ONCE(target->connected);
565
948d1e88
BVA		 566 target->qp_in_error = false;
567
aef9ec39
RD		 568 ret = srp_lookup_path(target);
569 if (ret)
570 return ret;
571
572 while (1) {
573 init_completion(&target->done);
574 ret = srp_send_req(target);
575 if (ret)
576 return ret;
577 wait_for_completion(&target->done);
578
579 /*
580 * The CM event handling code will set status to
581 * SRP_PORT_REDIRECT if we get a port redirect REJ
582 * back, or SRP_DLID_REDIRECT if we get a lid/qp
583 * redirect REJ back.
584 */
585 switch (target->status) {
586 case 0:
294c875a 587 srp_change_conn_state(target, true);
aef9ec39
RD		 588 return 0;
589
590 case SRP_PORT_REDIRECT:
591 ret = srp_lookup_path(target);
592 if (ret)
593 return ret;
594 break;
595
596 case SRP_DLID_REDIRECT:
597 break;
598
9fe4bcf4
DD		 599 case SRP_STALE_CONN:
600 /* Our current CM id was stale, and is now in timewait.
601 * Try to reconnect with a new one.
602 */
603 if (!retries-- || srp_new_cm_id(target)) {
604 shost_printk(KERN_ERR, target->scsi_host, PFX
605 "giving up on stale connection\n");
606 target->status = -ECONNRESET;
607 return target->status;
608 }
609
610 shost_printk(KERN_ERR, target->scsi_host, PFX
611 "retrying stale connection\n");
612 break;
613
aef9ec39
RD		 614 default:
615 return target->status;
616 }
617 }
618}
619
d945e1df
RD		 620static void srp_unmap_data(struct scsi_cmnd *scmnd,
621 struct srp_target_port *target,
622 struct srp_request *req)
623{
8f26c9ff
DD		 624 struct ib_device *ibdev = target->srp_host->srp_dev->dev;
625 struct ib_pool_fmr **pfmr;
626
bb350d1d 627 if (!scsi_sglist(scmnd) ||
d945e1df
RD		 628 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
629 scmnd->sc_data_direction != DMA_FROM_DEVICE))
630 return;
631
8f26c9ff
DD		 632 pfmr = req->fmr_list;
633 while (req->nfmr--)
634 ib_fmr_pool_unmap(*pfmr++);
f5358a17 635
8f26c9ff
DD		 636 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
637 scmnd->sc_data_direction);
d945e1df
RD		 638}
639
22032991
BVA		 640/**
641 * srp_claim_req - Take ownership of the scmnd associated with a request.
642 * @target: SRP target port.
643 * @req: SRP request.
644 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
645 * ownership of @req->scmnd if it equals @scmnd.
646 *
647 * Return value:
648 * Either NULL or a pointer to the SCSI command the caller became owner of.
649 */
650static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
651 struct srp_request *req,
652 struct scsi_cmnd *scmnd)
653{
654 unsigned long flags;
655
656 spin_lock_irqsave(&target->lock, flags);
657 if (!scmnd) {
658 scmnd = req->scmnd;
659 req->scmnd = NULL;
660 } else if (req->scmnd == scmnd) {
661 req->scmnd = NULL;
662 } else {
663 scmnd = NULL;
664 }
665 spin_unlock_irqrestore(&target->lock, flags);
666
667 return scmnd;
668}
669
670/**
671 * srp_free_req() - Unmap data and add request to the free request list.
672 */
673static void srp_free_req(struct srp_target_port *target,
674 struct srp_request *req, struct scsi_cmnd *scmnd,
675 s32 req_lim_delta)
526b4caa 676{
94a9174c
BVA		 677 unsigned long flags;
678
22032991
BVA		 679 srp_unmap_data(scmnd, target, req);
680
e9684678 681 spin_lock_irqsave(&target->lock, flags);
94a9174c 682 target->req_lim += req_lim_delta;
536ae14e 683 list_add_tail(&req->list, &target->free_reqs);
e9684678 684 spin_unlock_irqrestore(&target->lock, flags);
526b4caa
IR		 685}
686
687static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
688{
22032991
BVA		 689 struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);
690
691 if (scmnd) {
9b796d06 692 srp_free_req(target, req, scmnd, 0);
22032991
BVA		 693 scmnd->result = DID_RESET << 16;
694 scmnd->scsi_done(scmnd);
22032991 695 }
526b4caa
IR		 696}
697
aef9ec39
RD		 698static int srp_reconnect_target(struct srp_target_port *target)
699{
09be70a2 700 struct Scsi_Host *shost = target->scsi_host;
dcb4cb85 701 int i, ret;
aef9ec39 702
09be70a2 703 if (target->state != SRP_TARGET_LIVE)
aef9ec39 704 return -EAGAIN;
aef9ec39 705
09be70a2
BVA		 706 scsi_target_block(&shost->shost_gendev);
707
aef9ec39
RD		 708 srp_disconnect_target(target);
709 /*
710 * Now get a new local CM ID so that we avoid confusing the
711 * target in case things are really fouled up.
712 */
9fe4bcf4
DD		 713 ret = srp_new_cm_id(target);
714 if (ret)
09be70a2 715 goto unblock;
aef9ec39 716
73aa89ed 717 ret = srp_create_target_ib(target);
aef9ec39 718 if (ret)
09be70a2 719 goto unblock;
aef9ec39 720
536ae14e
BVA		 721 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
722 struct srp_request *req = &target->req_ring[i];
723 if (req->scmnd)
724 srp_reset_req(target, req);
725 }
aef9ec39 726
536ae14e 727 INIT_LIST_HEAD(&target->free_tx);
dcb4cb85 728 for (i = 0; i < SRP_SQ_SIZE; ++i)
536ae14e 729 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 730
731 ret = srp_connect_target(target);
09be70a2
BVA		 732
733unblock:
734 scsi_target_unblock(&shost->shost_gendev, ret == 0 ? SDEV_RUNNING :
735 SDEV_TRANSPORT_OFFLINE);
736
aef9ec39
RD		 737 if (ret)
738 goto err;
739
09be70a2 740 shost_printk(KERN_INFO, target->scsi_host, PFX "reconnect succeeded\n");
aef9ec39
RD		 741
742 return ret;
743
744err:
7aa54bd7
DD		 745 shost_printk(KERN_ERR, target->scsi_host,
746 PFX "reconnect failed (%d), removing target port.\n", ret);
aef9ec39
RD		 747
748 /*
749 * We couldn't reconnect, so kill our target port off.
9709f0e0
BVA		 750 * However, we have to defer the real removal because we
751 * are in the context of the SCSI error handler now, which
752 * will deadlock if we call scsi_remove_host().
aef9ec39 753 */
ef6c49d8 754 srp_queue_remove_work(target);
aef9ec39
RD		 755
756 return ret;
757}
758
8f26c9ff
DD		 759static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
760 unsigned int dma_len, u32 rkey)
f5358a17 761{
8f26c9ff 762 struct srp_direct_buf *desc = state->desc;
f5358a17 763
8f26c9ff
DD		 764 desc->va = cpu_to_be64(dma_addr);
765 desc->key = cpu_to_be32(rkey);
766 desc->len = cpu_to_be32(dma_len);
f5358a17 767
8f26c9ff
DD		 768 state->total_len += dma_len;
769 state->desc++;
770 state->ndesc++;
771}
559ce8f1 772
8f26c9ff
DD		 773static int srp_map_finish_fmr(struct srp_map_state *state,
774 struct srp_target_port *target)
775{
776 struct srp_device *dev = target->srp_host->srp_dev;
777 struct ib_pool_fmr *fmr;
778 u64 io_addr = 0;
85507bcc 779
8f26c9ff
DD		 780 if (!state->npages)
781 return 0;
f5358a17 782
8f26c9ff
DD		 783 if (state->npages == 1) {
784 srp_map_desc(state, state->base_dma_addr, state->fmr_len,
785 target->rkey);
786 state->npages = state->fmr_len = 0;
787 return 0;
f5358a17
RD		 788 }
789
8f26c9ff
DD		 790 fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
791 state->npages, io_addr);
792 if (IS_ERR(fmr))
793 return PTR_ERR(fmr);
f5358a17 794
8f26c9ff
DD		 795 *state->next_fmr++ = fmr;
796 state->nfmr++;
f5358a17 797
8f26c9ff
DD		 798 srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
799 state->npages = state->fmr_len = 0;
800 return 0;
801}
802
803static void srp_map_update_start(struct srp_map_state *state,
804 struct scatterlist *sg, int sg_index,
805 dma_addr_t dma_addr)
806{
807 state->unmapped_sg = sg;
808 state->unmapped_index = sg_index;
809 state->unmapped_addr = dma_addr;
810}
85507bcc 811
8f26c9ff
DD		 812static int srp_map_sg_entry(struct srp_map_state *state,
813 struct srp_target_port *target,
814 struct scatterlist *sg, int sg_index,
815 int use_fmr)
816{
817 struct srp_device *dev = target->srp_host->srp_dev;
818 struct ib_device *ibdev = dev->dev;
819 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
820 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
821 unsigned int len;
822 int ret;
823
824 if (!dma_len)
825 return 0;
826
827 if (use_fmr == SRP_MAP_NO_FMR) {
828 /* Once we're in direct map mode for a request, we don't
829 * go back to FMR mode, so no need to update anything
830 * other than the descriptor.
831 */
832 srp_map_desc(state, dma_addr, dma_len, target->rkey);
833 return 0;
85507bcc 834 }
f5358a17 835
8f26c9ff
DD		 836 /* If we start at an offset into the FMR page, don't merge into
837 * the current FMR. Finish it out, and use the kernel's MR for this
838 * sg entry. This is to avoid potential bugs on some SRP targets
839 * that were never quite defined, but went away when the initiator
840 * avoided using FMR on such page fragments.
841 */
842 if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
843 ret = srp_map_finish_fmr(state, target);
844 if (ret)
845 return ret;
846
847 srp_map_desc(state, dma_addr, dma_len, target->rkey);
848 srp_map_update_start(state, NULL, 0, 0);
849 return 0;
f5358a17
RD		 850 }
851
8f26c9ff
DD		 852 /* If this is the first sg to go into the FMR, save our position.
853 * We need to know the first unmapped entry, its index, and the
854 * first unmapped address within that entry to be able to restart
855 * mapping after an error.
856 */
857 if (!state->unmapped_sg)
858 srp_map_update_start(state, sg, sg_index, dma_addr);
f5358a17 859
8f26c9ff
DD		 860 while (dma_len) {
861 if (state->npages == SRP_FMR_SIZE) {
862 ret = srp_map_finish_fmr(state, target);
863 if (ret)
864 return ret;
f5358a17 865
8f26c9ff
DD		 866 srp_map_update_start(state, sg, sg_index, dma_addr);
867 }
868
869 len = min_t(unsigned int, dma_len, dev->fmr_page_size);
f5358a17 870
8f26c9ff
DD		 871 if (!state->npages)
872 state->base_dma_addr = dma_addr;
873 state->pages[state->npages++] = dma_addr;
874 state->fmr_len += len;
875 dma_addr += len;
876 dma_len -= len;
877 }
878
879 /* If the last entry of the FMR wasn't a full page, then we need to
880 * close it out and start a new one -- we can only merge at page
881 * boundries.
882 */
883 ret = 0;
884 if (len != dev->fmr_page_size) {
885 ret = srp_map_finish_fmr(state, target);
886 if (!ret)
887 srp_map_update_start(state, NULL, 0, 0);
888 }
f5358a17
RD		 889 return ret;
890}
891
aef9ec39
RD		 892static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
893 struct srp_request *req)
894{
8f26c9ff 895 struct scatterlist *scat, *sg;
aef9ec39 896 struct srp_cmd *cmd = req->cmd->buf;
8f26c9ff 897 int i, len, nents, count, use_fmr;
85507bcc
RC		 898 struct srp_device *dev;
899 struct ib_device *ibdev;
8f26c9ff
DD		 900 struct srp_map_state state;
901 struct srp_indirect_buf *indirect_hdr;
8f26c9ff
DD		 902 u32 table_len;
903 u8 fmt;
aef9ec39 904
bb350d1d 905 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
aef9ec39
RD		 906 return sizeof (struct srp_cmd);
907
908 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
909 scmnd->sc_data_direction != DMA_TO_DEVICE) {
7aa54bd7
DD		 910 shost_printk(KERN_WARNING, target->scsi_host,
911 PFX "Unhandled data direction %d\n",
912 scmnd->sc_data_direction);
aef9ec39
RD		 913 return -EINVAL;
914 }
915
bb350d1d
FT		 916 nents = scsi_sg_count(scmnd);
917 scat = scsi_sglist(scmnd);
aef9ec39 918
05321937 919 dev = target->srp_host->srp_dev;
85507bcc
RC		 920 ibdev = dev->dev;
921
922 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
8f26c9ff
DD		 923 if (unlikely(count == 0))
924 return -EIO;
f5358a17
RD		 925
926 fmt = SRP_DATA_DESC_DIRECT;
927 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
aef9ec39 928
cf368713 929 if (count == 1) {
f5358a17
RD		 930 /*
931 * The midlayer only generated a single gather/scatter
932 * entry, or DMA mapping coalesced everything to a
933 * single entry. So a direct descriptor along with
934 * the DMA MR suffices.
935 */
cf368713 936 struct srp_direct_buf *buf = (void *) cmd->add_data;
aef9ec39 937
85507bcc 938 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
9af76271 939 buf->key = cpu_to_be32(target->rkey);
85507bcc 940 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
8f26c9ff
DD		 941
942 req->nfmr = 0;
943 goto map_complete;
944 }
945
946 /* We have more than one scatter/gather entry, so build our indirect
947 * descriptor table, trying to merge as many entries with FMR as we
948 * can.
949 */
950 indirect_hdr = (void *) cmd->add_data;
951
c07d424d
DD		 952 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
953 target->indirect_size, DMA_TO_DEVICE);
954
8f26c9ff 955 memset(&state, 0, sizeof(state));
c07d424d 956 state.desc = req->indirect_desc;
8f26c9ff
DD		 957 state.pages = req->map_page;
958 state.next_fmr = req->fmr_list;
959
960 use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
961
962 for_each_sg(scat, sg, count, i) {
963 if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
964 /* FMR mapping failed, so backtrack to the first
965 * unmapped entry and continue on without using FMR.
966 */
967 dma_addr_t dma_addr;
968 unsigned int dma_len;
969
970backtrack:
971 sg = state.unmapped_sg;
972 i = state.unmapped_index;
973
974 dma_addr = ib_sg_dma_address(ibdev, sg);
975 dma_len = ib_sg_dma_len(ibdev, sg);
976 dma_len -= (state.unmapped_addr - dma_addr);
977 dma_addr = state.unmapped_addr;
978 use_fmr = SRP_MAP_NO_FMR;
979 srp_map_desc(&state, dma_addr, dma_len, target->rkey);
f5358a17 980 }
8f26c9ff 981 }
aef9ec39 982
8f26c9ff
DD		 983 if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
984 goto backtrack;
cf368713 985
c07d424d
DD		 986 /* We've mapped the request, now pull as much of the indirect
987 * descriptor table as we can into the command buffer. If this
988 * target is not using an external indirect table, we are
989 * guaranteed to fit into the command, as the SCSI layer won't
990 * give us more S/G entries than we allow.
8f26c9ff
DD		 991 */
992 req->nfmr = state.nfmr;
993 if (state.ndesc == 1) {
994 /* FMR mapping was able to collapse this to one entry,
995 * so use a direct descriptor.
996 */
997 struct srp_direct_buf *buf = (void *) cmd->add_data;
cf368713 998
c07d424d 999 *buf = req->indirect_desc[0];
8f26c9ff 1000 goto map_complete;
aef9ec39
RD		 1001 }
1002
c07d424d
DD		 1003 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1004 !target->allow_ext_sg)) {
1005 shost_printk(KERN_ERR, target->scsi_host,
1006 "Could not fit S/G list into SRP_CMD\n");
1007 return -EIO;
1008 }
1009
1010 count = min(state.ndesc, target->cmd_sg_cnt);
8f26c9ff
DD		 1011 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1012
1013 fmt = SRP_DATA_DESC_INDIRECT;
1014 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
c07d424d 1015 len += count * sizeof (struct srp_direct_buf);
8f26c9ff 1016
c07d424d
DD		 1017 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1018 count * sizeof (struct srp_direct_buf));
8f26c9ff 1019
c07d424d 1020 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
8f26c9ff
DD		 1021 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1022 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1023 indirect_hdr->len = cpu_to_be32(state.total_len);
1024
1025 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
c07d424d 1026 cmd->data_out_desc_cnt = count;
8f26c9ff 1027 else
c07d424d
DD		 1028 cmd->data_in_desc_cnt = count;
1029
1030 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1031 DMA_TO_DEVICE);
8f26c9ff
DD		 1032
1033map_complete:
aef9ec39
RD		 1034 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1035 cmd->buf_fmt = fmt << 4;
1036 else
1037 cmd->buf_fmt = fmt;
1038
aef9ec39
RD		 1039 return len;
1040}
1041
76c75b25
BVA		 1042/*
1043 * Return an IU and possible credit to the free pool
1044 */
1045static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
1046 enum srp_iu_type iu_type)
1047{
1048 unsigned long flags;
1049
e9684678 1050 spin_lock_irqsave(&target->lock, flags);
76c75b25
BVA		 1051 list_add(&iu->list, &target->free_tx);
1052 if (iu_type != SRP_IU_RSP)
1053 ++target->req_lim;
e9684678 1054 spin_unlock_irqrestore(&target->lock, flags);
76c75b25
BVA		 1055}
1056
05a1d750 1057/*
e9684678
BVA		 1058 * Must be called with target->lock held to protect req_lim and free_tx.
1059 * If IU is not sent, it must be returned using srp_put_tx_iu().
05a1d750
DD		 1060 *
1061 * Note:
1062 * An upper limit for the number of allocated information units for each
1063 * request type is:
1064 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1065 * more than Scsi_Host.can_queue requests.
1066 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1067 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1068 * one unanswered SRP request to an initiator.
1069 */
1070static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
1071 enum srp_iu_type iu_type)
1072{
1073 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1074 struct srp_iu *iu;
1075
1076 srp_send_completion(target->send_cq, target);
1077
dcb4cb85 1078 if (list_empty(&target->free_tx))
05a1d750
DD		 1079 return NULL;
1080
1081 /* Initiator responses to target requests do not consume credits */
76c75b25
BVA		 1082 if (iu_type != SRP_IU_RSP) {
1083 if (target->req_lim <= rsv) {
1084 ++target->zero_req_lim;
1085 return NULL;
1086 }
1087
1088 --target->req_lim;
05a1d750
DD		 1089 }
1090
dcb4cb85 1091 iu = list_first_entry(&target->free_tx, struct srp_iu, list);
76c75b25 1092 list_del(&iu->list);
05a1d750
DD		 1093 return iu;
1094}
1095
76c75b25
BVA		 1096static int srp_post_send(struct srp_target_port *target,
1097 struct srp_iu *iu, int len)
05a1d750
DD		 1098{
1099 struct ib_sge list;
1100 struct ib_send_wr wr, *bad_wr;
05a1d750
DD		 1101
1102 list.addr = iu->dma;
1103 list.length = len;
9af76271 1104 list.lkey = target->lkey;
05a1d750
DD		 1105
1106 wr.next = NULL;
dcb4cb85 1107 wr.wr_id = (uintptr_t) iu;
05a1d750
DD		 1108 wr.sg_list = &list;
1109 wr.num_sge = 1;
1110 wr.opcode = IB_WR_SEND;
1111 wr.send_flags = IB_SEND_SIGNALED;
1112
76c75b25 1113 return ib_post_send(target->qp, &wr, &bad_wr);
05a1d750
DD		 1114}
1115
dcb4cb85 1116static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
c996bb47 1117{
c996bb47 1118 struct ib_recv_wr wr, *bad_wr;
dcb4cb85 1119 struct ib_sge list;
c996bb47
BVA		 1120
1121 list.addr = iu->dma;
1122 list.length = iu->size;
9af76271 1123 list.lkey = target->lkey;
c996bb47
BVA		 1124
1125 wr.next = NULL;
dcb4cb85 1126 wr.wr_id = (uintptr_t) iu;
c996bb47
BVA		 1127 wr.sg_list = &list;
1128 wr.num_sge = 1;
1129
dcb4cb85 1130 return ib_post_recv(target->qp, &wr, &bad_wr);
c996bb47
BVA		 1131}
1132
aef9ec39
RD		 1133static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
1134{
1135 struct srp_request *req;
1136 struct scsi_cmnd *scmnd;
1137 unsigned long flags;
aef9ec39 1138
aef9ec39 1139 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
e9684678 1140 spin_lock_irqsave(&target->lock, flags);
94a9174c 1141 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
e9684678 1142 spin_unlock_irqrestore(&target->lock, flags);
94a9174c 1143
f8b6e31e
DD		 1144 target->tsk_mgmt_status = -1;
1145 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1146 target->tsk_mgmt_status = rsp->data[3];
1147 complete(&target->tsk_mgmt_done);
aef9ec39 1148 } else {
f8b6e31e 1149 req = &target->req_ring[rsp->tag];
22032991
BVA		 1150 scmnd = srp_claim_req(target, req, NULL);
1151 if (!scmnd) {
7aa54bd7
DD		 1152 shost_printk(KERN_ERR, target->scsi_host,
1153 "Null scmnd for RSP w/tag %016llx\n",
1154 (unsigned long long) rsp->tag);
22032991
BVA		 1155
1156 spin_lock_irqsave(&target->lock, flags);
1157 target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1158 spin_unlock_irqrestore(&target->lock, flags);
1159
1160 return;
1161 }
aef9ec39
RD		 1162 scmnd->result = rsp->status;
1163
1164 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1165 memcpy(scmnd->sense_buffer, rsp->data +
1166 be32_to_cpu(rsp->resp_data_len),
1167 min_t(int, be32_to_cpu(rsp->sense_data_len),
1168 SCSI_SENSE_BUFFERSIZE));
1169 }
1170
1171 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
bb350d1d 1172 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
aef9ec39 1173 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
bb350d1d 1174 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
aef9ec39 1175
22032991
BVA		 1176 srp_free_req(target, req, scmnd,
1177 be32_to_cpu(rsp->req_lim_delta));
1178
f8b6e31e
DD		 1179 scmnd->host_scribble = NULL;
1180 scmnd->scsi_done(scmnd);
aef9ec39 1181 }
aef9ec39
RD		 1182}
1183
bb12588a
DD		 1184static int srp_response_common(struct srp_target_port *target, s32 req_delta,
1185 void *rsp, int len)
1186{
76c75b25 1187 struct ib_device *dev = target->srp_host->srp_dev->dev;
bb12588a
DD		 1188 unsigned long flags;
1189 struct srp_iu *iu;
76c75b25 1190 int err;
bb12588a 1191
e9684678 1192 spin_lock_irqsave(&target->lock, flags);
bb12588a 1193 target->req_lim += req_delta;
bb12588a 1194 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
e9684678 1195 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1196
bb12588a
DD		 1197 if (!iu) {
1198 shost_printk(KERN_ERR, target->scsi_host, PFX
1199 "no IU available to send response\n");
76c75b25 1200 return 1;
bb12588a
DD		 1201 }
1202
1203 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1204 memcpy(iu->buf, rsp, len);
1205 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1206
76c75b25
BVA		 1207 err = srp_post_send(target, iu, len);
1208 if (err) {
bb12588a
DD		 1209 shost_printk(KERN_ERR, target->scsi_host, PFX
1210 "unable to post response: %d\n", err);
76c75b25
BVA		 1211 srp_put_tx_iu(target, iu, SRP_IU_RSP);
1212 }
bb12588a 1213
bb12588a
DD		 1214 return err;
1215}
1216
1217static void srp_process_cred_req(struct srp_target_port *target,
1218 struct srp_cred_req *req)
1219{
1220 struct srp_cred_rsp rsp = {
1221 .opcode = SRP_CRED_RSP,
1222 .tag = req->tag,
1223 };
1224 s32 delta = be32_to_cpu(req->req_lim_delta);
1225
1226 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1227 shost_printk(KERN_ERR, target->scsi_host, PFX
1228 "problems processing SRP_CRED_REQ\n");
1229}
1230
1231static void srp_process_aer_req(struct srp_target_port *target,
1232 struct srp_aer_req *req)
1233{
1234 struct srp_aer_rsp rsp = {
1235 .opcode = SRP_AER_RSP,
1236 .tag = req->tag,
1237 };
1238 s32 delta = be32_to_cpu(req->req_lim_delta);
1239
1240 shost_printk(KERN_ERR, target->scsi_host, PFX
1241 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1242
1243 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1244 shost_printk(KERN_ERR, target->scsi_host, PFX
1245 "problems processing SRP_AER_REQ\n");
1246}
1247
aef9ec39
RD		 1248static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1249{
dcb4cb85 1250 struct ib_device *dev = target->srp_host->srp_dev->dev;
737b94eb 1251 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
c996bb47 1252 int res;
aef9ec39
RD		 1253 u8 opcode;
1254
85507bcc
RC		 1255 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1256 DMA_FROM_DEVICE);
aef9ec39
RD		 1257
1258 opcode = *(u8 *) iu->buf;
1259
1260 if (0) {
7aa54bd7
DD		 1261 shost_printk(KERN_ERR, target->scsi_host,
1262 PFX "recv completion, opcode 0x%02x\n", opcode);
7a700811
BVA		 1263 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1264 iu->buf, wc->byte_len, true);
aef9ec39
RD		 1265 }
1266
1267 switch (opcode) {
1268 case SRP_RSP:
1269 srp_process_rsp(target, iu->buf);
1270 break;
1271
bb12588a
DD		 1272 case SRP_CRED_REQ:
1273 srp_process_cred_req(target, iu->buf);
1274 break;
1275
1276 case SRP_AER_REQ:
1277 srp_process_aer_req(target, iu->buf);
1278 break;
1279
aef9ec39
RD		 1280 case SRP_T_LOGOUT:
1281 /* XXX Handle target logout */
7aa54bd7
DD		 1282 shost_printk(KERN_WARNING, target->scsi_host,
1283 PFX "Got target logout request\n");
aef9ec39
RD		 1284 break;
1285
1286 default:
7aa54bd7
DD		 1287 shost_printk(KERN_WARNING, target->scsi_host,
1288 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
aef9ec39
RD		 1289 break;
1290 }
1291
85507bcc
RC		 1292 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1293 DMA_FROM_DEVICE);
c996bb47 1294
dcb4cb85 1295 res = srp_post_recv(target, iu);
c996bb47
BVA		 1296 if (res != 0)
1297 shost_printk(KERN_ERR, target->scsi_host,
1298 PFX "Recv failed with error code %d\n", res);
aef9ec39
RD		 1299}
1300
948d1e88
BVA		 1301static void srp_handle_qp_err(enum ib_wc_status wc_status,
1302 enum ib_wc_opcode wc_opcode,
1303 struct srp_target_port *target)
1304{
294c875a 1305 if (target->connected && !target->qp_in_error) {
4f0af697
BVA		 1306 shost_printk(KERN_ERR, target->scsi_host,
1307 PFX "failed %s status %d\n",
1308 wc_opcode & IB_WC_RECV ? "receive" : "send",
1309 wc_status);
1310 }
948d1e88
BVA		 1311 target->qp_in_error = true;
1312}
1313
9c03dc9f 1314static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
aef9ec39
RD		 1315{
1316 struct srp_target_port *target = target_ptr;
1317 struct ib_wc wc;
aef9ec39
RD		 1318
1319 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1320 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1321 if (likely(wc.status == IB_WC_SUCCESS)) {
1322 srp_handle_recv(target, &wc);
1323 } else {
1324 srp_handle_qp_err(wc.status, wc.opcode, target);
aef9ec39 1325 }
9c03dc9f
BVA		 1326 }
1327}
1328
1329static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1330{
1331 struct srp_target_port *target = target_ptr;
1332 struct ib_wc wc;
dcb4cb85 1333 struct srp_iu *iu;
9c03dc9f
BVA		 1334
1335 while (ib_poll_cq(cq, 1, &wc) > 0) {
948d1e88
BVA		 1336 if (likely(wc.status == IB_WC_SUCCESS)) {
1337 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1338 list_add(&iu->list, &target->free_tx);
1339 } else {
1340 srp_handle_qp_err(wc.status, wc.opcode, target);
9c03dc9f 1341 }
aef9ec39
RD		 1342 }
1343}
1344
76c75b25 1345static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
aef9ec39 1346{
76c75b25 1347 struct srp_target_port *target = host_to_target(shost);
aef9ec39
RD		 1348 struct srp_request *req;
1349 struct srp_iu *iu;
1350 struct srp_cmd *cmd;
85507bcc 1351 struct ib_device *dev;
76c75b25 1352 unsigned long flags;
aef9ec39
RD		 1353 int len;
1354
e9684678 1355 spin_lock_irqsave(&target->lock, flags);
bb12588a 1356 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
aef9ec39 1357 if (!iu)
695b8349
BVA		 1358 goto err_unlock;
1359
1360 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1361 list_del(&req->list);
1362 spin_unlock_irqrestore(&target->lock, flags);
aef9ec39 1363
05321937 1364 dev = target->srp_host->srp_dev->dev;
49248644 1365 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
85507bcc 1366 DMA_TO_DEVICE);
aef9ec39 1367
aef9ec39 1368 scmnd->result = 0;
f8b6e31e 1369 scmnd->host_scribble = (void *) req;
aef9ec39
RD		 1370
1371 cmd = iu->buf;
1372 memset(cmd, 0, sizeof *cmd);
1373
1374 cmd->opcode = SRP_CMD;
1375 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
d945e1df 1376 cmd->tag = req->index;
aef9ec39
RD		 1377 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1378
aef9ec39
RD		 1379 req->scmnd = scmnd;
1380 req->cmd = iu;
aef9ec39
RD		 1381
1382 len = srp_map_data(scmnd, target, req);
1383 if (len < 0) {
7aa54bd7
DD		 1384 shost_printk(KERN_ERR, target->scsi_host,
1385 PFX "Failed to map data\n");
76c75b25 1386 goto err_iu;
aef9ec39
RD		 1387 }
1388
49248644 1389 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
85507bcc 1390 DMA_TO_DEVICE);
aef9ec39 1391
76c75b25 1392 if (srp_post_send(target, iu, len)) {
7aa54bd7 1393 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
aef9ec39
RD		 1394 goto err_unmap;
1395 }
1396
aef9ec39
RD		 1397 return 0;
1398
1399err_unmap:
1400 srp_unmap_data(scmnd, target, req);
1401
76c75b25
BVA		 1402err_iu:
1403 srp_put_tx_iu(target, iu, SRP_IU_CMD);
1404
e9684678 1405 spin_lock_irqsave(&target->lock, flags);
76c75b25 1406 list_add(&req->list, &target->free_reqs);
695b8349
BVA		 1407
1408err_unlock:
e9684678 1409 spin_unlock_irqrestore(&target->lock, flags);
76c75b25 1410
aef9ec39
RD		 1411 return SCSI_MLQUEUE_HOST_BUSY;
1412}
1413
1414static int srp_alloc_iu_bufs(struct srp_target_port *target)
1415{
1416 int i;
1417
1418 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1419 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1420 target->max_ti_iu_len,
1421 GFP_KERNEL, DMA_FROM_DEVICE);
1422 if (!target->rx_ring[i])
1423 goto err;
1424 }
1425
dd5e6e38 1426 for (i = 0; i < SRP_SQ_SIZE; ++i) {
aef9ec39 1427 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
49248644 1428 target->max_iu_len,
aef9ec39
RD		 1429 GFP_KERNEL, DMA_TO_DEVICE);
1430 if (!target->tx_ring[i])
1431 goto err;
dcb4cb85
BVA		 1432
1433 list_add(&target->tx_ring[i]->list, &target->free_tx);
aef9ec39
RD		 1434 }
1435
1436 return 0;
1437
1438err:
1439 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1440 srp_free_iu(target->srp_host, target->rx_ring[i]);
1441 target->rx_ring[i] = NULL;
1442 }
1443
dd5e6e38 1444 for (i = 0; i < SRP_SQ_SIZE; ++i) {
aef9ec39
RD		 1445 srp_free_iu(target->srp_host, target->tx_ring[i]);
1446 target->tx_ring[i] = NULL;
1447 }
1448
1449 return -ENOMEM;
1450}
1451
c9b03c1a
BVA		 1452static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
1453{
1454 uint64_t T_tr_ns, max_compl_time_ms;
1455 uint32_t rq_tmo_jiffies;
1456
1457 /*
1458 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
1459 * table 91), both the QP timeout and the retry count have to be set
1460 * for RC QP's during the RTR to RTS transition.
1461 */
1462 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
1463 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
1464
1465 /*
1466 * Set target->rq_tmo_jiffies to one second more than the largest time
1467 * it can take before an error completion is generated. See also
1468 * C9-140..142 in the IBTA spec for more information about how to
1469 * convert the QP Local ACK Timeout value to nanoseconds.
1470 */
1471 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
1472 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
1473 do_div(max_compl_time_ms, NSEC_PER_MSEC);
1474 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
1475
1476 return rq_tmo_jiffies;
1477}
1478
961e0be8
DD		 1479static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
1480 struct srp_login_rsp *lrsp,
1481 struct srp_target_port *target)
1482{
1483 struct ib_qp_attr *qp_attr = NULL;
1484 int attr_mask = 0;
1485 int ret;
1486 int i;
1487
1488 if (lrsp->opcode == SRP_LOGIN_RSP) {
1489 target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
1490 target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
1491
1492 /*
1493 * Reserve credits for task management so we don't
1494 * bounce requests back to the SCSI mid-layer.
1495 */
1496 target->scsi_host->can_queue
1497 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1498 target->scsi_host->can_queue);
1499 } else {
1500 shost_printk(KERN_WARNING, target->scsi_host,
1501 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
1502 ret = -ECONNRESET;
1503 goto error;
1504 }
1505
1506 if (!target->rx_ring[0]) {
1507 ret = srp_alloc_iu_bufs(target);
1508 if (ret)
1509 goto error;
1510 }
1511
1512 ret = -ENOMEM;
1513 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1514 if (!qp_attr)
1515 goto error;
1516
1517 qp_attr->qp_state = IB_QPS_RTR;
1518 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1519 if (ret)
1520 goto error_free;
1521
1522 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1523 if (ret)
1524 goto error_free;
1525
1526 for (i = 0; i < SRP_RQ_SIZE; i++) {
1527 struct srp_iu *iu = target->rx_ring[i];
1528 ret = srp_post_recv(target, iu);
1529 if (ret)
1530 goto error_free;
1531 }
1532
1533 qp_attr->qp_state = IB_QPS_RTS;
1534 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1535 if (ret)
1536 goto error_free;
1537
c9b03c1a
BVA		 1538 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
1539
961e0be8
DD		 1540 ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
1541 if (ret)
1542 goto error_free;
1543
1544 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1545
1546error_free:
1547 kfree(qp_attr);
1548
1549error:
1550 target->status = ret;
1551}
1552
aef9ec39
RD		 1553static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1554 struct ib_cm_event *event,
1555 struct srp_target_port *target)
1556{
7aa54bd7 1557 struct Scsi_Host *shost = target->scsi_host;
aef9ec39
RD		 1558 struct ib_class_port_info *cpi;
1559 int opcode;
1560
1561 switch (event->param.rej_rcvd.reason) {
1562 case IB_CM_REJ_PORT_CM_REDIRECT:
1563 cpi = event->param.rej_rcvd.ari;
1564 target->path.dlid = cpi->redirect_lid;
1565 target->path.pkey = cpi->redirect_pkey;
1566 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1567 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1568
1569 target->status = target->path.dlid ?
1570 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1571 break;
1572
1573 case IB_CM_REJ_PORT_REDIRECT:
5d7cbfd6 1574 if (srp_target_is_topspin(target)) {
aef9ec39
RD		 1575 /*
1576 * Topspin/Cisco SRP gateways incorrectly send
1577 * reject reason code 25 when they mean 24
1578 * (port redirect).
1579 */
1580 memcpy(target->path.dgid.raw,
1581 event->param.rej_rcvd.ari, 16);
1582
7aa54bd7
DD		 1583 shost_printk(KERN_DEBUG, shost,
1584 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1585 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1586 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
aef9ec39
RD		 1587
1588 target->status = SRP_PORT_REDIRECT;
1589 } else {
7aa54bd7
DD		 1590 shost_printk(KERN_WARNING, shost,
1591 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
aef9ec39
RD		 1592 target->status = -ECONNRESET;
1593 }
1594 break;
1595
1596 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
7aa54bd7
DD		 1597 shost_printk(KERN_WARNING, shost,
1598 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
aef9ec39
RD		 1599 target->status = -ECONNRESET;
1600 break;
1601
1602 case IB_CM_REJ_CONSUMER_DEFINED:
1603 opcode = *(u8 *) event->private_data;
1604 if (opcode == SRP_LOGIN_REJ) {
1605 struct srp_login_rej *rej = event->private_data;
1606 u32 reason = be32_to_cpu(rej->reason);
1607
1608 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
7aa54bd7
DD		 1609 shost_printk(KERN_WARNING, shost,
1610 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
aef9ec39 1611 else
7aa54bd7
DD		 1612 shost_printk(KERN_WARNING, shost,
1613 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
aef9ec39 1614 } else
7aa54bd7
DD		 1615 shost_printk(KERN_WARNING, shost,
1616 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1617 " opcode 0x%02x\n", opcode);
aef9ec39
RD		 1618 target->status = -ECONNRESET;
1619 break;
1620
9fe4bcf4
DD		 1621 case IB_CM_REJ_STALE_CONN:
1622 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1623 target->status = SRP_STALE_CONN;
1624 break;
1625
aef9ec39 1626 default:
7aa54bd7
DD		 1627 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1628 event->param.rej_rcvd.reason);
aef9ec39
RD		 1629 target->status = -ECONNRESET;
1630 }
1631}
1632
1633static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1634{
1635 struct srp_target_port *target = cm_id->context;
aef9ec39 1636 int comp = 0;
aef9ec39
RD		 1637
1638 switch (event->event) {
1639 case IB_CM_REQ_ERROR:
7aa54bd7
DD		 1640 shost_printk(KERN_DEBUG, target->scsi_host,
1641 PFX "Sending CM REQ failed\n");
aef9ec39
RD		 1642 comp = 1;
1643 target->status = -ECONNRESET;
1644 break;
1645
1646 case IB_CM_REP_RECEIVED:
1647 comp = 1;
961e0be8 1648 srp_cm_rep_handler(cm_id, event->private_data, target);
aef9ec39
RD		 1649 break;
1650
1651 case IB_CM_REJ_RECEIVED:
7aa54bd7 1652 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
aef9ec39
RD		 1653 comp = 1;
1654
1655 srp_cm_rej_handler(cm_id, event, target);
1656 break;
1657
b7ac4ab4 1658 case IB_CM_DREQ_RECEIVED:
7aa54bd7
DD		 1659 shost_printk(KERN_WARNING, target->scsi_host,
1660 PFX "DREQ received - connection closed\n");
294c875a 1661 srp_change_conn_state(target, false);
b7ac4ab4 1662 if (ib_send_cm_drep(cm_id, NULL, 0))
7aa54bd7
DD		 1663 shost_printk(KERN_ERR, target->scsi_host,
1664 PFX "Sending CM DREP failed\n");
aef9ec39
RD		 1665 break;
1666
1667 case IB_CM_TIMEWAIT_EXIT:
7aa54bd7
DD		 1668 shost_printk(KERN_ERR, target->scsi_host,
1669 PFX "connection closed\n");
aef9ec39 1670
aef9ec39
RD		 1671 target->status = 0;
1672 break;
1673
b7ac4ab4
IR		 1674 case IB_CM_MRA_RECEIVED:
1675 case IB_CM_DREQ_ERROR:
1676 case IB_CM_DREP_RECEIVED:
1677 break;
1678
aef9ec39 1679 default:
7aa54bd7
DD		 1680 shost_printk(KERN_WARNING, target->scsi_host,
1681 PFX "Unhandled CM event %d\n", event->event);
aef9ec39
RD		 1682 break;
1683 }
1684
1685 if (comp)
1686 complete(&target->done);
1687
aef9ec39
RD		 1688 return 0;
1689}
1690
d945e1df 1691static int srp_send_tsk_mgmt(struct srp_target_port *target,
f8b6e31e 1692 u64 req_tag, unsigned int lun, u8 func)
aef9ec39 1693{
19081f31 1694 struct ib_device *dev = target->srp_host->srp_dev->dev;
aef9ec39
RD		 1695 struct srp_iu *iu;
1696 struct srp_tsk_mgmt *tsk_mgmt;
aef9ec39 1697
3780d1f0
BVA		 1698 if (!target->connected || target->qp_in_error)
1699 return -1;
1700
f8b6e31e 1701 init_completion(&target->tsk_mgmt_done);
aef9ec39 1702
e9684678 1703 spin_lock_irq(&target->lock);
bb12588a 1704 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
e9684678 1705 spin_unlock_irq(&target->lock);
76c75b25 1706
aef9ec39 1707 if (!iu)
76c75b25 1708 return -1;
aef9ec39 1709
19081f31
DD		 1710 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1711 DMA_TO_DEVICE);
aef9ec39
RD		 1712 tsk_mgmt = iu->buf;
1713 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1714
1715 tsk_mgmt->opcode = SRP_TSK_MGMT;
f8b6e31e
DD		 1716 tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
1717 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
aef9ec39 1718 tsk_mgmt->tsk_mgmt_func = func;
f8b6e31e 1719 tsk_mgmt->task_tag = req_tag;
aef9ec39 1720
19081f31
DD		 1721 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1722 DMA_TO_DEVICE);
76c75b25
BVA		 1723 if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
1724 srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
1725 return -1;
1726 }
d945e1df 1727
f8b6e31e 1728 if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
aef9ec39 1729 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
d945e1df 1730 return -1;
aef9ec39 1731
d945e1df 1732 return 0;
d945e1df
RD		 1733}
1734
aef9ec39
RD		 1735static int srp_abort(struct scsi_cmnd *scmnd)
1736{
d945e1df 1737 struct srp_target_port *target = host_to_target(scmnd->device->host);
f8b6e31e 1738 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
d945e1df 1739
7aa54bd7 1740 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
aef9ec39 1741
22032991 1742 if (!req || target->qp_in_error || !srp_claim_req(target, req, scmnd))
d945e1df 1743 return FAILED;
22032991
BVA		 1744 srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
1745 SRP_TSK_ABORT_TASK);
1746 srp_free_req(target, req, scmnd, 0);
1747 scmnd->result = DID_ABORT << 16;
d8536670 1748 scmnd->scsi_done(scmnd);
d945e1df 1749
22032991 1750 return SUCCESS;
aef9ec39
RD		 1751}
1752
1753static int srp_reset_device(struct scsi_cmnd *scmnd)
1754{
d945e1df 1755 struct srp_target_port *target = host_to_target(scmnd->device->host);
536ae14e 1756 int i;
d945e1df 1757
7aa54bd7 1758 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
aef9ec39 1759
f8b6e31e
DD		 1760 if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
1761 SRP_TSK_LUN_RESET))
d945e1df 1762 return FAILED;
f8b6e31e 1763 if (target->tsk_mgmt_status)
d945e1df
RD		 1764 return FAILED;
1765
536ae14e
BVA		 1766 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1767 struct srp_request *req = &target->req_ring[i];
f8b6e31e 1768 if (req->scmnd && req->scmnd->device == scmnd->device)
526b4caa 1769 srp_reset_req(target, req);
536ae14e 1770 }
d945e1df 1771
d945e1df 1772 return SUCCESS;
aef9ec39
RD		 1773}
1774
1775static int srp_reset_host(struct scsi_cmnd *scmnd)
1776{
1777 struct srp_target_port *target = host_to_target(scmnd->device->host);
1778 int ret = FAILED;
1779
7aa54bd7 1780 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
aef9ec39
RD		 1781
1782 if (!srp_reconnect_target(target))
1783 ret = SUCCESS;
1784
1785 return ret;
1786}
1787
c9b03c1a
BVA		 1788static int srp_slave_configure(struct scsi_device *sdev)
1789{
1790 struct Scsi_Host *shost = sdev->host;
1791 struct srp_target_port *target = host_to_target(shost);
1792 struct request_queue *q = sdev->request_queue;
1793 unsigned long timeout;
1794
1795 if (sdev->type == TYPE_DISK) {
1796 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
1797 blk_queue_rq_timeout(q, timeout);
1798 }
1799
1800 return 0;
1801}
1802
ee959b00
TJ		 1803static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1804 char *buf)
6ecb0c84 1805{
ee959b00 1806 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1807
6ecb0c84
RD		 1808 return sprintf(buf, "0x%016llx\n",
1809 (unsigned long long) be64_to_cpu(target->id_ext));
1810}
1811
ee959b00
TJ		 1812static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1813 char *buf)
6ecb0c84 1814{
ee959b00 1815 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1816
6ecb0c84
RD		 1817 return sprintf(buf, "0x%016llx\n",
1818 (unsigned long long) be64_to_cpu(target->ioc_guid));
1819}
1820
ee959b00
TJ		 1821static ssize_t show_service_id(struct device *dev,
1822 struct device_attribute *attr, char *buf)
6ecb0c84 1823{
ee959b00 1824 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1825
6ecb0c84
RD		 1826 return sprintf(buf, "0x%016llx\n",
1827 (unsigned long long) be64_to_cpu(target->service_id));
1828}
1829
ee959b00
TJ		 1830static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1831 char *buf)
6ecb0c84 1832{
ee959b00 1833 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1834
6ecb0c84
RD		 1835 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1836}
1837
ee959b00
TJ		 1838static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1839 char *buf)
6ecb0c84 1840{
ee959b00 1841 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6ecb0c84 1842
5b095d98 1843 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
6ecb0c84
RD		 1844}
1845
ee959b00
TJ		 1846static ssize_t show_orig_dgid(struct device *dev,
1847 struct device_attribute *attr, char *buf)
3633b3d0 1848{
ee959b00 1849 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3633b3d0 1850
5b095d98 1851 return sprintf(buf, "%pI6\n", target->orig_dgid);
3633b3d0
IR		 1852}
1853
89de7486
BVA		 1854static ssize_t show_req_lim(struct device *dev,
1855 struct device_attribute *attr, char *buf)
1856{
1857 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1858
89de7486
BVA		 1859 return sprintf(buf, "%d\n", target->req_lim);
1860}
1861
ee959b00
TJ		 1862static ssize_t show_zero_req_lim(struct device *dev,
1863 struct device_attribute *attr, char *buf)
6bfa24fa 1864{
ee959b00 1865 struct srp_target_port *target = host_to_target(class_to_shost(dev));
6bfa24fa 1866
6bfa24fa
RD		 1867 return sprintf(buf, "%d\n", target->zero_req_lim);
1868}
1869
ee959b00
TJ		 1870static ssize_t show_local_ib_port(struct device *dev,
1871 struct device_attribute *attr, char *buf)
ded7f1a1 1872{
ee959b00 1873 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1
IR		 1874
1875 return sprintf(buf, "%d\n", target->srp_host->port);
1876}
1877
ee959b00
TJ		 1878static ssize_t show_local_ib_device(struct device *dev,
1879 struct device_attribute *attr, char *buf)
ded7f1a1 1880{
ee959b00 1881 struct srp_target_port *target = host_to_target(class_to_shost(dev));
ded7f1a1 1882
05321937 1883 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
ded7f1a1
IR		 1884}
1885
49248644
DD		 1886static ssize_t show_cmd_sg_entries(struct device *dev,
1887 struct device_attribute *attr, char *buf)
1888{
1889 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1890
1891 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
1892}
1893
c07d424d
DD		 1894static ssize_t show_allow_ext_sg(struct device *dev,
1895 struct device_attribute *attr, char *buf)
1896{
1897 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1898
1899 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
1900}
1901
ee959b00
TJ		 1902static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1903static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1904static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1905static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1906static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1907static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
89de7486 1908static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
ee959b00
TJ		 1909static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1910static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1911static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
49248644 1912static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
c07d424d 1913static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
ee959b00
TJ		 1914
1915static struct device_attribute *srp_host_attrs[] = {
1916 &dev_attr_id_ext,
1917 &dev_attr_ioc_guid,
1918 &dev_attr_service_id,
1919 &dev_attr_pkey,
1920 &dev_attr_dgid,
1921 &dev_attr_orig_dgid,
89de7486 1922 &dev_attr_req_lim,
ee959b00
TJ		 1923 &dev_attr_zero_req_lim,
1924 &dev_attr_local_ib_port,
1925 &dev_attr_local_ib_device,
49248644 1926 &dev_attr_cmd_sg_entries,
c07d424d 1927 &dev_attr_allow_ext_sg,
6ecb0c84
RD		 1928 NULL
1929};
1930
aef9ec39
RD		 1931static struct scsi_host_template srp_template = {
1932 .module = THIS_MODULE,
b7f008fd
RD		 1933 .name = "InfiniBand SRP initiator",
1934 .proc_name = DRV_NAME,
c9b03c1a 1935 .slave_configure = srp_slave_configure,
aef9ec39
RD		 1936 .info = srp_target_info,
1937 .queuecommand = srp_queuecommand,
1938 .eh_abort_handler = srp_abort,
1939 .eh_device_reset_handler = srp_reset_device,
1940 .eh_host_reset_handler = srp_reset_host,
49248644 1941 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
dd5e6e38 1942 .can_queue = SRP_CMD_SQ_SIZE,
aef9ec39 1943 .this_id = -1,
dd5e6e38 1944 .cmd_per_lun = SRP_CMD_SQ_SIZE,
6ecb0c84
RD		 1945 .use_clustering = ENABLE_CLUSTERING,
1946 .shost_attrs = srp_host_attrs
aef9ec39
RD		 1947};
1948
1949static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1950{
3236822b
FT		 1951 struct srp_rport_identifiers ids;
1952 struct srp_rport *rport;
1953
aef9ec39
RD		 1954 sprintf(target->target_name, "SRP.T10:%016llX",
1955 (unsigned long long) be64_to_cpu(target->id_ext));
1956
05321937 1957 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
aef9ec39
RD		 1958 return -ENODEV;
1959
3236822b
FT		 1960 memcpy(ids.port_id, &target->id_ext, 8);
1961 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
aebd5e47 1962 ids.roles = SRP_RPORT_ROLE_TARGET;
3236822b
FT		 1963 rport = srp_rport_add(target->scsi_host, &ids);
1964 if (IS_ERR(rport)) {
1965 scsi_remove_host(target->scsi_host);
1966 return PTR_ERR(rport);
1967 }
1968
dc1bdbd9
BVA		 1969 rport->lld_data = target;
1970
b3589fd4 1971 spin_lock(&host->target_lock);
aef9ec39 1972 list_add_tail(&target->list, &host->target_list);
b3589fd4 1973 spin_unlock(&host->target_lock);
aef9ec39
RD		 1974
1975 target->state = SRP_TARGET_LIVE;
1976
aef9ec39 1977 scsi_scan_target(&target->scsi_host->shost_gendev,
1962a4a1 1978 0, target->scsi_id, SCAN_WILD_CARD, 0);
aef9ec39
RD		 1979
1980 return 0;
1981}
1982
ee959b00 1983static void srp_release_dev(struct device *dev)
aef9ec39
RD		 1984{
1985 struct srp_host *host =
ee959b00 1986 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 1987
1988 complete(&host->released);
1989}
1990
1991static struct class srp_class = {
1992 .name = "infiniband_srp",
ee959b00 1993 .dev_release = srp_release_dev
aef9ec39
RD		 1994};
1995
1996/*
1997 * Target ports are added by writing
1998 *
1999 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2000 * pkey=<P_Key>,service_id=<service ID>
2001 *
2002 * to the add_target sysfs attribute.
2003 */
2004enum {
2005 SRP_OPT_ERR = 0,
2006 SRP_OPT_ID_EXT = 1 << 0,
2007 SRP_OPT_IOC_GUID = 1 << 1,
2008 SRP_OPT_DGID = 1 << 2,
2009 SRP_OPT_PKEY = 1 << 3,
2010 SRP_OPT_SERVICE_ID = 1 << 4,
2011 SRP_OPT_MAX_SECT = 1 << 5,
52fb2b50 2012 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
0c0450db 2013 SRP_OPT_IO_CLASS = 1 << 7,
01cb9bcb 2014 SRP_OPT_INITIATOR_EXT = 1 << 8,
49248644 2015 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
c07d424d
DD		 2016 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2017 SRP_OPT_SG_TABLESIZE = 1 << 11,
aef9ec39
RD		 2018 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2019 SRP_OPT_IOC_GUID |
2020 SRP_OPT_DGID |
2021 SRP_OPT_PKEY |
2022 SRP_OPT_SERVICE_ID),
2023};
2024
a447c093 2025static const match_table_t srp_opt_tokens = {
52fb2b50
VP		 2026 { SRP_OPT_ID_EXT, "id_ext=%s" },
2027 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2028 { SRP_OPT_DGID, "dgid=%s" },
2029 { SRP_OPT_PKEY, "pkey=%x" },
2030 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2031 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2032 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
0c0450db 2033 { SRP_OPT_IO_CLASS, "io_class=%x" },
01cb9bcb 2034 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
49248644 2035 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
c07d424d
DD		 2036 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2037 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
52fb2b50 2038 { SRP_OPT_ERR, NULL }
aef9ec39
RD		 2039};
2040
2041static int srp_parse_options(const char *buf, struct srp_target_port *target)
2042{
2043 char *options, *sep_opt;
2044 char *p;
2045 char dgid[3];
2046 substring_t args[MAX_OPT_ARGS];
2047 int opt_mask = 0;
2048 int token;
2049 int ret = -EINVAL;
2050 int i;
2051
2052 options = kstrdup(buf, GFP_KERNEL);
2053 if (!options)
2054 return -ENOMEM;
2055
2056 sep_opt = options;
2057 while ((p = strsep(&sep_opt, ",")) != NULL) {
2058 if (!*p)
2059 continue;
2060
2061 token = match_token(p, srp_opt_tokens, args);
2062 opt_mask |= token;
2063
2064 switch (token) {
2065 case SRP_OPT_ID_EXT:
2066 p = match_strdup(args);
a20f3a6d
IR		 2067 if (!p) {
2068 ret = -ENOMEM;
2069 goto out;
2070 }
aef9ec39
RD		 2071 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2072 kfree(p);
2073 break;
2074
2075 case SRP_OPT_IOC_GUID:
2076 p = match_strdup(args);
a20f3a6d
IR		 2077 if (!p) {
2078 ret = -ENOMEM;
2079 goto out;
2080 }
aef9ec39
RD		 2081 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2082 kfree(p);
2083 break;
2084
2085 case SRP_OPT_DGID:
2086 p = match_strdup(args);
a20f3a6d
IR		 2087 if (!p) {
2088 ret = -ENOMEM;
2089 goto out;
2090 }
aef9ec39 2091 if (strlen(p) != 32) {
e0bda7d8 2092 pr_warn("bad dest GID parameter '%s'\n", p);
ce1823f0 2093 kfree(p);
aef9ec39
RD		 2094 goto out;
2095 }
2096
2097 for (i = 0; i < 16; ++i) {
2098 strlcpy(dgid, p + i * 2, 3);
2099 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
2100 }
bf17c1c7 2101 kfree(p);
3633b3d0 2102 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
aef9ec39
RD		 2103 break;
2104
2105 case SRP_OPT_PKEY:
2106 if (match_hex(args, &token)) {
e0bda7d8 2107 pr_warn("bad P_Key parameter '%s'\n", p);
aef9ec39
RD		 2108 goto out;
2109 }
2110 target->path.pkey = cpu_to_be16(token);
2111 break;
2112
2113 case SRP_OPT_SERVICE_ID:
2114 p = match_strdup(args);
a20f3a6d
IR		 2115 if (!p) {
2116 ret = -ENOMEM;
2117 goto out;
2118 }
aef9ec39 2119 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
247e020e 2120 target->path.service_id = target->service_id;
aef9ec39
RD		 2121 kfree(p);
2122 break;
2123
2124 case SRP_OPT_MAX_SECT:
2125 if (match_int(args, &token)) {
e0bda7d8 2126 pr_warn("bad max sect parameter '%s'\n", p);
aef9ec39
RD		 2127 goto out;
2128 }
2129 target->scsi_host->max_sectors = token;
2130 break;
2131
52fb2b50
VP		 2132 case SRP_OPT_MAX_CMD_PER_LUN:
2133 if (match_int(args, &token)) {
e0bda7d8
BVA		 2134 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2135 p);
52fb2b50
VP		 2136 goto out;
2137 }
dd5e6e38 2138 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
52fb2b50
VP		 2139 break;
2140
0c0450db
R		 2141 case SRP_OPT_IO_CLASS:
2142 if (match_hex(args, &token)) {
e0bda7d8 2143 pr_warn("bad IO class parameter '%s'\n", p);
0c0450db
R		 2144 goto out;
2145 }
2146 if (token != SRP_REV10_IB_IO_CLASS &&
2147 token != SRP_REV16A_IB_IO_CLASS) {
e0bda7d8
BVA		 2148 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2149 token, SRP_REV10_IB_IO_CLASS,
2150 SRP_REV16A_IB_IO_CLASS);
0c0450db
R		 2151 goto out;
2152 }
2153 target->io_class = token;
2154 break;
2155
01cb9bcb
IR		 2156 case SRP_OPT_INITIATOR_EXT:
2157 p = match_strdup(args);
a20f3a6d
IR		 2158 if (!p) {
2159 ret = -ENOMEM;
2160 goto out;
2161 }
01cb9bcb
IR		 2162 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2163 kfree(p);
2164 break;
2165
49248644
DD		 2166 case SRP_OPT_CMD_SG_ENTRIES:
2167 if (match_int(args, &token) || token < 1 || token > 255) {
e0bda7d8
BVA		 2168 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2169 p);
49248644
DD		 2170 goto out;
2171 }
2172 target->cmd_sg_cnt = token;
2173 break;
2174
c07d424d
DD		 2175 case SRP_OPT_ALLOW_EXT_SG:
2176 if (match_int(args, &token)) {
e0bda7d8 2177 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
c07d424d
DD		 2178 goto out;
2179 }
2180 target->allow_ext_sg = !!token;
2181 break;
2182
2183 case SRP_OPT_SG_TABLESIZE:
2184 if (match_int(args, &token) || token < 1 ||
2185 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
e0bda7d8
BVA		 2186 pr_warn("bad max sg_tablesize parameter '%s'\n",
2187 p);
c07d424d
DD		 2188 goto out;
2189 }
2190 target->sg_tablesize = token;
2191 break;
2192
aef9ec39 2193 default:
e0bda7d8
BVA		 2194 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2195 p);
aef9ec39
RD		 2196 goto out;
2197 }
2198 }
2199
2200 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
2201 ret = 0;
2202 else
2203 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
2204 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
2205 !(srp_opt_tokens[i].token & opt_mask))
e0bda7d8
BVA		 2206 pr_warn("target creation request is missing parameter '%s'\n",
2207 srp_opt_tokens[i].pattern);
aef9ec39
RD		 2208
2209out:
2210 kfree(options);
2211 return ret;
2212}
2213
ee959b00
TJ		 2214static ssize_t srp_create_target(struct device *dev,
2215 struct device_attribute *attr,
aef9ec39
RD		 2216 const char *buf, size_t count)
2217{
2218 struct srp_host *host =
ee959b00 2219 container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2220 struct Scsi_Host *target_host;
2221 struct srp_target_port *target;
c07d424d
DD		 2222 struct ib_device *ibdev = host->srp_dev->dev;
2223 dma_addr_t dma_addr;
8f26c9ff 2224 int i, ret;
aef9ec39
RD		 2225
2226 target_host = scsi_host_alloc(&srp_template,
2227 sizeof (struct srp_target_port));
2228 if (!target_host)
2229 return -ENOMEM;
2230
49248644 2231 target_host->transportt = ib_srp_transport_template;
fd1b6c4a
BVA		 2232 target_host->max_channel = 0;
2233 target_host->max_id = 1;
3c8edf0e
AR		 2234 target_host->max_lun = SRP_MAX_LUN;
2235 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
5f068992 2236
aef9ec39 2237 target = host_to_target(target_host);
aef9ec39 2238
49248644
DD		 2239 target->io_class = SRP_REV16A_IB_IO_CLASS;
2240 target->scsi_host = target_host;
2241 target->srp_host = host;
2242 target->lkey = host->srp_dev->mr->lkey;
2243 target->rkey = host->srp_dev->mr->rkey;
2244 target->cmd_sg_cnt = cmd_sg_entries;
c07d424d
DD		 2245 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
2246 target->allow_ext_sg = allow_ext_sg;
aef9ec39 2247
aef9ec39
RD		 2248 ret = srp_parse_options(buf, target);
2249 if (ret)
2250 goto err;
2251
c07d424d
DD		 2252 if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
2253 target->cmd_sg_cnt < target->sg_tablesize) {
e0bda7d8 2254 pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
c07d424d
DD		 2255 target->sg_tablesize = target->cmd_sg_cnt;
2256 }
2257
2258 target_host->sg_tablesize = target->sg_tablesize;
2259 target->indirect_size = target->sg_tablesize *
2260 sizeof (struct srp_direct_buf);
49248644
DD		 2261 target->max_iu_len = sizeof (struct srp_cmd) +
2262 sizeof (struct srp_indirect_buf) +
2263 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
2264
ef6c49d8 2265 INIT_WORK(&target->remove_work, srp_remove_work);
8f26c9ff
DD		 2266 spin_lock_init(&target->lock);
2267 INIT_LIST_HEAD(&target->free_tx);
2268 INIT_LIST_HEAD(&target->free_reqs);
2269 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
2270 struct srp_request *req = &target->req_ring[i];
2271
2272 req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof (void *),
2273 GFP_KERNEL);
2274 req->map_page = kmalloc(SRP_FMR_SIZE * sizeof (void *),
2275 GFP_KERNEL);
c07d424d
DD		 2276 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
2277 if (!req->fmr_list || !req->map_page || !req->indirect_desc)
8f26c9ff
DD		 2278 goto err_free_mem;
2279
c07d424d
DD		 2280 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
2281 target->indirect_size,
2282 DMA_TO_DEVICE);
2283 if (ib_dma_mapping_error(ibdev, dma_addr))
2284 goto err_free_mem;
2285
2286 req->indirect_dma_addr = dma_addr;
8f26c9ff
DD		 2287 req->index = i;
2288 list_add_tail(&req->list, &target->free_reqs);
2289 }
2290
c07d424d 2291 ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
aef9ec39 2292
7aa54bd7
DD		 2293 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2294 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
5b095d98 2295 "service_id %016llx dgid %pI6\n",
aef9ec39
RD		 2296 (unsigned long long) be64_to_cpu(target->id_ext),
2297 (unsigned long long) be64_to_cpu(target->ioc_guid),
2298 be16_to_cpu(target->path.pkey),
2299 (unsigned long long) be64_to_cpu(target->service_id),
8867cd7c 2300 target->path.dgid.raw);
aef9ec39
RD		 2301
2302 ret = srp_create_target_ib(target);
2303 if (ret)
8f26c9ff 2304 goto err_free_mem;
aef9ec39 2305
9fe4bcf4
DD		 2306 ret = srp_new_cm_id(target);
2307 if (ret)
8f26c9ff 2308 goto err_free_ib;
aef9ec39
RD		 2309
2310 ret = srp_connect_target(target);
2311 if (ret) {
7aa54bd7
DD		 2312 shost_printk(KERN_ERR, target->scsi_host,
2313 PFX "Connection failed\n");
aef9ec39
RD		 2314 goto err_cm_id;
2315 }
2316
2317 ret = srp_add_target(host, target);
2318 if (ret)
2319 goto err_disconnect;
2320
2321 return count;
2322
2323err_disconnect:
2324 srp_disconnect_target(target);
2325
2326err_cm_id:
2327 ib_destroy_cm_id(target->cm_id);
2328
8f26c9ff 2329err_free_ib:
aef9ec39
RD		 2330 srp_free_target_ib(target);
2331
8f26c9ff
DD		 2332err_free_mem:
2333 srp_free_req_data(target);
2334
aef9ec39
RD		 2335err:
2336 scsi_host_put(target_host);
2337
2338 return ret;
2339}
2340
ee959b00 2341static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
aef9ec39 2342
ee959b00
TJ		 2343static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2344 char *buf)
aef9ec39 2345{
ee959b00 2346 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39 2347
05321937 2348 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
aef9ec39
RD		 2349}
2350
ee959b00 2351static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
aef9ec39 2352
ee959b00
TJ		 2353static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2354 char *buf)
aef9ec39 2355{
ee959b00 2356 struct srp_host *host = container_of(dev, struct srp_host, dev);
aef9ec39
RD		 2357
2358 return sprintf(buf, "%d\n", host->port);
2359}
2360
ee959b00 2361static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
aef9ec39 2362
f5358a17 2363static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
aef9ec39
RD		 2364{
2365 struct srp_host *host;
2366
2367 host = kzalloc(sizeof *host, GFP_KERNEL);
2368 if (!host)
2369 return NULL;
2370
2371 INIT_LIST_HEAD(&host->target_list);
b3589fd4 2372 spin_lock_init(&host->target_lock);
aef9ec39 2373 init_completion(&host->released);
05321937 2374 host->srp_dev = device;
aef9ec39
RD		 2375 host->port = port;
2376
ee959b00
TJ		 2377 host->dev.class = &srp_class;
2378 host->dev.parent = device->dev->dma_device;
d927e38c 2379 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
aef9ec39 2380
ee959b00 2381 if (device_register(&host->dev))
f5358a17 2382 goto free_host;
ee959b00 2383 if (device_create_file(&host->dev, &dev_attr_add_target))
aef9ec39 2384 goto err_class;
ee959b00 2385 if (device_create_file(&host->dev, &dev_attr_ibdev))
aef9ec39 2386 goto err_class;
ee959b00 2387 if (device_create_file(&host->dev, &dev_attr_port))
aef9ec39
RD		 2388 goto err_class;
2389
2390 return host;
2391
2392err_class:
ee959b00 2393 device_unregister(&host->dev);
aef9ec39 2394
f5358a17 2395free_host:
aef9ec39
RD		 2396 kfree(host);
2397
2398 return NULL;
2399}
2400
2401static void srp_add_one(struct ib_device *device)
2402{
f5358a17
RD		 2403 struct srp_device *srp_dev;
2404 struct ib_device_attr *dev_attr;
2405 struct ib_fmr_pool_param fmr_param;
aef9ec39 2406 struct srp_host *host;
be8b9814 2407 int max_pages_per_fmr, fmr_page_shift, s, e, p;
aef9ec39 2408
f5358a17
RD		 2409 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2410 if (!dev_attr)
cf311cd4 2411 return;
aef9ec39 2412
f5358a17 2413 if (ib_query_device(device, dev_attr)) {
e0bda7d8 2414 pr_warn("Query device failed for %s\n", device->name);
f5358a17
RD		 2415 goto free_attr;
2416 }
2417
2418 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2419 if (!srp_dev)
2420 goto free_attr;
2421
2422 /*
2423 * Use the smallest page size supported by the HCA, down to a
8f26c9ff
DD		 2424 * minimum of 4096 bytes. We're unlikely to build large sglists
2425 * out of smaller entries.
f5358a17 2426 */
8f26c9ff
DD		 2427 fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
2428 srp_dev->fmr_page_size = 1 << fmr_page_shift;
2429 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2430 srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
f5358a17
RD		 2431
2432 INIT_LIST_HEAD(&srp_dev->dev_list);
2433
2434 srp_dev->dev = device;
2435 srp_dev->pd = ib_alloc_pd(device);
2436 if (IS_ERR(srp_dev->pd))
2437 goto free_dev;
2438
2439 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2440 IB_ACCESS_LOCAL_WRITE |
2441 IB_ACCESS_REMOTE_READ |
2442 IB_ACCESS_REMOTE_WRITE);
2443 if (IS_ERR(srp_dev->mr))
2444 goto err_pd;
2445
be8b9814
DD		 2446 for (max_pages_per_fmr = SRP_FMR_SIZE;
2447 max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
2448 max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
2449 memset(&fmr_param, 0, sizeof fmr_param);
2450 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2451 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2452 fmr_param.cache = 1;
2453 fmr_param.max_pages_per_fmr = max_pages_per_fmr;
2454 fmr_param.page_shift = fmr_page_shift;
2455 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2456 IB_ACCESS_REMOTE_WRITE |
2457 IB_ACCESS_REMOTE_READ);
2458
2459 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2460 if (!IS_ERR(srp_dev->fmr_pool))
2461 break;
2462 }
2463
f5358a17
RD		 2464 if (IS_ERR(srp_dev->fmr_pool))
2465 srp_dev->fmr_pool = NULL;
aef9ec39 2466
07ebafba 2467 if (device->node_type == RDMA_NODE_IB_SWITCH) {
aef9ec39
RD		 2468 s = 0;
2469 e = 0;
2470 } else {
2471 s = 1;
2472 e = device->phys_port_cnt;
2473 }
2474
2475 for (p = s; p <= e; ++p) {
f5358a17 2476 host = srp_add_port(srp_dev, p);
aef9ec39 2477 if (host)
f5358a17 2478 list_add_tail(&host->list, &srp_dev->dev_list);
aef9ec39
RD		 2479 }
2480
f5358a17
RD		 2481 ib_set_client_data(device, &srp_client, srp_dev);
2482
2483 goto free_attr;
2484
2485err_pd:
2486 ib_dealloc_pd(srp_dev->pd);
2487
2488free_dev:
2489 kfree(srp_dev);
2490
2491free_attr:
2492 kfree(dev_attr);
aef9ec39
RD		 2493}
2494
2495static void srp_remove_one(struct ib_device *device)
2496{
f5358a17 2497 struct srp_device *srp_dev;
aef9ec39 2498 struct srp_host *host, *tmp_host;
ef6c49d8 2499 struct srp_target_port *target;
aef9ec39 2500
f5358a17 2501 srp_dev = ib_get_client_data(device, &srp_client);
aef9ec39 2502
f5358a17 2503 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
ee959b00 2504 device_unregister(&host->dev);
aef9ec39
RD		 2505 /*
2506 * Wait for the sysfs entry to go away, so that no new
2507 * target ports can be created.
2508 */
2509 wait_for_completion(&host->released);
2510
2511 /*
ef6c49d8 2512 * Remove all target ports.
aef9ec39 2513 */
b3589fd4 2514 spin_lock(&host->target_lock);
ef6c49d8
BVA		 2515 list_for_each_entry(target, &host->target_list, list)
2516 srp_queue_remove_work(target);
b3589fd4 2517 spin_unlock(&host->target_lock);
aef9ec39
RD		 2518
2519 /*
ef6c49d8 2520 * Wait for target port removal tasks.
aef9ec39 2521 */
ef6c49d8 2522 flush_workqueue(system_long_wq);
aef9ec39 2523
aef9ec39
RD		 2524 kfree(host);
2525 }
2526
f5358a17
RD		 2527 if (srp_dev->fmr_pool)
2528 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2529 ib_dereg_mr(srp_dev->mr);
2530 ib_dealloc_pd(srp_dev->pd);
2531
2532 kfree(srp_dev);
aef9ec39
RD		 2533}
2534
3236822b 2535static struct srp_function_template ib_srp_transport_functions = {
dc1bdbd9 2536 .rport_delete = srp_rport_delete,
3236822b
FT		 2537};
2538
aef9ec39
RD		 2539static int __init srp_init_module(void)
2540{
2541 int ret;
2542
dcb4cb85 2543 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
dd5e6e38 2544
49248644 2545 if (srp_sg_tablesize) {
e0bda7d8 2546 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
49248644
DD		 2547 if (!cmd_sg_entries)
2548 cmd_sg_entries = srp_sg_tablesize;
2549 }
2550
2551 if (!cmd_sg_entries)
2552 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
2553
2554 if (cmd_sg_entries > 255) {
e0bda7d8 2555 pr_warn("Clamping cmd_sg_entries to 255\n");
49248644 2556 cmd_sg_entries = 255;
1e89a194
DD		 2557 }
2558
c07d424d
DD		 2559 if (!indirect_sg_entries)
2560 indirect_sg_entries = cmd_sg_entries;
2561 else if (indirect_sg_entries < cmd_sg_entries) {
e0bda7d8
BVA		 2562 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
2563 cmd_sg_entries);
c07d424d
DD		 2564 indirect_sg_entries = cmd_sg_entries;
2565 }
2566
3236822b
FT		 2567 ib_srp_transport_template =
2568 srp_attach_transport(&ib_srp_transport_functions);
2569 if (!ib_srp_transport_template)
2570 return -ENOMEM;
2571
aef9ec39
RD		 2572 ret = class_register(&srp_class);
2573 if (ret) {
e0bda7d8 2574 pr_err("couldn't register class infiniband_srp\n");
3236822b 2575 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2576 return ret;
2577 }
2578
c1a0b23b
MT		 2579 ib_sa_register_client(&srp_sa_client);
2580
aef9ec39
RD		 2581 ret = ib_register_client(&srp_client);
2582 if (ret) {
e0bda7d8 2583 pr_err("couldn't register IB client\n");
3236822b 2584 srp_release_transport(ib_srp_transport_template);
c1a0b23b 2585 ib_sa_unregister_client(&srp_sa_client);
aef9ec39
RD		 2586 class_unregister(&srp_class);
2587 return ret;
2588 }
2589
2590 return 0;
2591}
2592
2593static void __exit srp_cleanup_module(void)
2594{
2595 ib_unregister_client(&srp_client);
c1a0b23b 2596 ib_sa_unregister_client(&srp_sa_client);
aef9ec39 2597 class_unregister(&srp_class);
3236822b 2598 srp_release_transport(ib_srp_transport_template);
aef9ec39
RD		 2599}
2600
2601module_init(srp_init_module);
2602module_exit(srp_cleanup_module);
Linux kernel - Deliverables
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